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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 84 (Fixed And MOVEABLE Window System) >> Diagnostic Information and Procedures >> DTC B0283: Rear Defrost Circuit Short Or Open >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2016 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

Relay Test

  1. Ignition OFF, disconnect the KR5 Rear Defogger Relay.
  2. Test for 60-180 Ω between terminals 86 and 85.
    • If less than 60 Ω or greater than 180 Ω 

      Replace the KR5 Rear Defogger Relay.

    • If between 60-180 Ω 
  3. Test for infinite resistance between the terminals listed below:
    • 86 and 30
    • 86 and 87
    • 85 and 30
    • 85 and 87
    • If less than infinite resistance 

      Replace the KR5 Rear Defogger Relay.

    • If infinite resistance 
  4. Install a 3 A fused jumper wire between relay terminal 86 and 12 V. Install a jumper wire between relay terminal 85 and ground.
  5. Test for less than 2 Ω between terminals 30 and 87.
    • If 2 Ω or greater 

      Replace the KR5 Rear Defogger Relay.

    • If less than 2 Ω 
  6. All OK